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Neutralisation for OCR GCSE Chemistry

Neutralisation

This page covers the following topics:

1. Neutralisation reactions

A neutralisation reaction is a reaction between an acid and a base during which a salt and water is formed. The salt is usually named by using a combination of the base positive ion and an acid negative ion. For example, sodium hydroxide with sulphuric acid would produce sodium sulphate and water. Many neutralisation reactions can be simplified to just Hโบ + OHโป โ†’ Hโ‚‚O.

Acids react with some metal oxides and metal hydroxides to produce a salt and water.
CaO + Hโ‚‚SOโ‚„ โ†’ CaSOโ‚„ + Hโ‚‚O
KOH + HCl โ†’ KCl + Hโ‚‚O

Acids can also be neutralised when reacting with carbonates. Acids, both strong and weak, react with metal carbonates to produce a salt, water and carbon dioxide.
MgCOโ‚ƒ + 2HCl โ†’ MgClโ‚‚ + Hโ‚‚O + COโ‚‚

Neutralisation reactions

1

What are the two main ions responsible for the production of Hโ‚‚O in a reaction between an acid and an alkali?

Many neutralisation reactions can be simplified to just Hโบ + OHโป โ†’ Hโ‚‚O.

Hโบ, OHโป

What are the two main ions responsible for the production of Hโ‚‚O in a reaction between an acid and an alkali?

2

What is a neutralisation reaction?

A neutralisation reaction is a reaction between an acid and a base during which a salt and water is formed.

a reaction between an acid and a base with a salt and water formed

What is a neutralisation reaction?

3

Hydrochloric acid is added to each of the test tubes presented in the image. Which of the test tubes will have bubbles forming in them?

Acids react with metal carbonates to produce a salt, water and carbon dioxide that can be observed as bubbles.
Naโ‚‚COโ‚ƒ: will react with the acid to produce a salt, water and COโ‚‚ โ†’ yes
KOH: will react but will only produce a salt and water โ†’ no
CaCOโ‚ƒ: will react with the acid to produce a salt, water and COโ‚‚ โ†’ yes
HCl: would not react with itself โ†’ no
BaClโ‚‚: would not react โ†’ no

A, C

Hydrochloric acid is added to each of the test tubes presented in the image. Which of the test tubes will have bubbles forming in them?

4

What compounds are produced during the reaction between calcium oxide and nitric acid?

A neutralisation reaction is a reaction between an acid and a base during which a salt and water is formed. The salt is usually named by using a combination of the base positive ion and an acid negative ion. Calcium oxide has a positive calcium ion, nitric acid has a negative nitrate ion.

calcium nitrate, water

What compounds are produced during the reaction between calcium oxide and nitric acid?

5

Provide an equation for a chemical reaction between calcium carbonate and hydrochloric acid.

Acids, both strong and weak, react with metal carbonates to produce a salt, water and carbon dioxide.

CaCOโ‚ƒ + 2HCl โ†’ CaClโ‚‚ + Hโ‚‚O + COโ‚‚

Provide an equation for a chemical reaction between calcium carbonate and hydrochloric acid.

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